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1. Neutron Emission in Fission And Quasi-Fission of Hs

Author

I. M. Itkis, M. G. Itkis, G. N. Knyazheva, E. M. Kozulin, L. Krupa, F. Hanappe, O. Dorvaux, L. Stuttge, Yu. E. Penionzhkevich, and S. M. Lukyanov

Subjects
Chemical kinetics, Nuclear reaction, Isotope, Fission, Neutron emission, Chemistry, Nuclear Theory, Coulomb barrier, Neutron, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Mass and energy distributions of fission‐like fragments obtained in the reactions 26Mg+248Cm, 36S+238U and 58Fe+208Pb leading to the formation of 266,274Hs are reported. From the analysis of TKE distributions for symmetric fragment it was found that at energies below the Coulomb barrier the bimodal fission of 274Hs, formed in the reaction 26Mg+248Cm, is observed, while in the reaction 36S+238U at these energies the main part of the symmetric fragments arises from the quasi‐fission process. At energies above the Coulomb barrier the fusion‐fission is a main process leading to the formation of symmetric fragment for the both reactions. In the case of 58Fe+208Pb reaction the quasi‐fission process is the main reaction mechanism at all measured energies. The pre‐ and post‐scission neutron multiplicities as a function of the fragment mass have been obtained for all studied reactions.

Published
2010
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2. Spectroscopy of transfermium nuclei using the GABRIELA set up at the focal plane of the VASSILISSA recoil separator

Author

K. Hauschild, A. Lopez-Martens, Ch. Briançon, P. Désesquelles, S. Garcia-Santamaria, A. Korichi, J. Robin, O. Dorvaux, J. Piot, D. Curien, B. Gall, F. Khalfallah, A. Khouaja, M. Rousseau, L. Stuttgé, N. Rowley, A. V. Yeremin, A. V. Belozerov, M. L. Chelnokov, V. I. Chepigin, V. A. Gorshkov, A. V. Isaev, I. N. Izosimov, A. P. Kabachenko, D. E. Katrasev, A. N. Kutznetzov, O. N. Malyshev, A. G. Popeko, R. N. Sagaidak, A. V. Shutov, E. A. Sokol, A. I. Svirikhin, T. Wiborg-Hagen, M. Guttormsen, A. C. Larsen, H. T. Nyhus, S. Siem, N. U. H. Syed, F. Hanappe, V. Bouchat, P. Jones, R. Borcea, G. Drafta, D. Pantelica, F. Rotaru, N. Scintee, V. Zamfir, A. Görgen, Ch. Theisen, A. Minkova, T. Kutsarova, Ch. Stodel, S. Mullins, E. Lieder, S. Antalic, Š. Šáro, M. Venhart, Yu. E. Penionzhkevich, S. M. Lukyanov, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Yu.E. Penionzhkevich, S.M. Lukyanov, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Electron spectroscopy, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Internal conversion, gamma-ray spectroscopy, spontaneous fission, 0202 electrical engineering, electronic engineering, information engineering, 29.30.Dn, 29.30.Kv, 23.60.+e, 25.45.Hi, Nuclear fusion, alpha-decay, 020201 artificial intelligence & image processing, Gamma spectroscopy, Alpha decay, Radioactive decay, Spontaneous fission
Abstract

International audience; An IN2P3-JINR collaboration has launched a project called GABRIELA at the Flerov Laboratory for Nuclear Reactions (FLNR) within the Joint Institute for Nuclear Research (JINR) in Dubna (Russia). The goal of the project is to perform gamma-ray and internal conversion electron spectroscopy of heavy nuclei produced in fusion-evaporation reactions and transported to the focal plane of the recoil separator VASSILISSA. During five experimental campaigns of GABRIELA, the detection system has gained in sensitivity and new spectroscopic information has been obtained for 249Fm, 251Fm, 253No and 255Lr.

Published
2010
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3. Spectroscopy of heavy elements at Dubna

Author

O. Dorvaux, A. Lopez-Martens, K. Hauschild, A. V. Yeremin, A. Khouaja, A. V. Belozerov, Ch. Briançon, M. L. Chelnokov, V. I. Chepigin, D. Curien, P. Désesquelles, B. Gall, V. A. Gorshkov, M. Guttormsen, F. Hanappe, A. P. Kabachenko, F. Khalfallah, A. Korichi, A. C. Larsen, O. N. Malyshev, A. Minkova, Yu. Ts. Oganessian, A. G. Popeko, M. Rousseau, N. Rowley, R. N. Sagaidak, S. Sharo, A. V. Shutov, S. Siem, V. I. L. Stuttgé, A. I. Svirikhin, N. U. H. Syed, Ch. Theisen, P. Demetriou, R. Julin, and S. V. Harissopulos

Subjects
Physics, Nuclear physics, Recoil, Isotope, Isotonic, Nuclear structure, Nuclear Experiment, Spectroscopy
Abstract

In 2004, the GABRIELA (Gamma Alpha Beta Recoil Investigation with the Electromagnetic Analyzer VASSILISSA) collaboration started a twofold scientific program at the FLNR (Dubna) laboratory : (a) the systematic study of the behaviour of single particle states within isotopic and isotonic chains with Z = 100–104 as N varies from 152 to 162 and (b) the study of isotopes for which very little spectroscopic information is known. After discussing the Physics motivations and the experimental setup, some new results concerning the structure of 249Fm and 253No nuclei, and some preliminary results on the decay of 217Pa decay are presented.

Published
2008
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4. Angular Correlations Between Fragment Spin and Prompt Neutron Evaporation in Spontaneous Fission of 252Cf: CORA-Demon Experiment

Author

E. Prokhorova, F. Gönnenwein, Yu. Kopatch, M. Mutterer, F. Hanappe, V. Kinnard, L. Stuttgé, O. Dorvaux, H.-J. Wollersheim, Yu. E. Penionzhkevich, E. A. Cherepanov, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Yu. E. Penionzhkevich, E. A. Cherepanov

Subjects
25.85.Ca, 25.70.Pq, 23.20.En, 21.10.Gv, Cold fission, cadmium, Fission, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Double ionization, Nuclear Theory, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, spontaneous fission, Prompt neutron, 0202 electrical engineering, electronic engineering, information engineering, Neutron, Nuclear Experiment, angular correlation techniques, Spontaneous fission, Physics, Cluster decay, nuclei with mass number 220 or higher, neutrons, 020206 networking & telecommunications, nuclear fragmentation, 020201 artificial intelligence & image processing, Atomic physics
Abstract

International audience; A novel method to search for the anisotropic emission of prompt neutrons in the center-of-mass system of fission fragments is presented. The anisotropy is conjectured to be due to the large spins of fission fragments are known to carry. Triple neutron- neutron-fragment correlations in spontaneous fission of $^{252}$Cf were investigated in an exploratory experiment dubbed CORA-DEMON experiment. Fission fragments were intercepted in a double ionization chamber while neutrons were spotted in 2 two-dimensional cylindrical walls of Demon detectors with the target on the vertical cylinder axis. A new method of analysis of triple angular correlations between 2 neutrons and a fission fragment was applied. Preliminary results are reported.

Published
2007
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5. Evidence Of A (1d[sub 52])[sup 2] Component To The 12Be Ground State

Author

W. N. Catford, S. D. Pain, N. A. Orr, Alain Ninane, G. Normand, V. Bouchat, Martin Freer, N. I. Ashwood, Neven Soić, B. R. Fulton, N. Curtis, J. S. Winfield, J. C. Angélique, M. Labiche, F. Hanappe, L. Stuttge, C. N. Timis, J.L. Lecouey, D. Mahboub, J. A. Tostevin, N. M. Clarke, V. A. Ziman, and Roy Crawford Lemmon

Subjects
Physics, chemistry.chemical_element, 020206 networking & telecommunications, 02 engineering and technology, Ion, Nuclear physics, chemistry, Coincident, Excited state, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Neutron, Atomic physics, Beryllium, Ground state, Glauber, Beam (structure)
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. The cross sections for the production of 11Be in its ground state (1/2 +) and first excited state (0.32 MeV, 1/2 -) have previously been measured, indicating a strong (2s 1 2) 2 component to the 12Be ground state. In the present experiment, performed at the GANIL laboratory, cross sections for the first (0.32 MeV, 1/2 -) and second (1.78 MeV, 5/2 +, unbound) excited states in 11Be were measured, which gives information on the admixture of (1p 1 2) 2 and (1d 5 2) 2 components in the ground state of 12Be. A fragmentation beam of 12Be of ∼10000 pps (95% pure) was incident on a carbon target at 41 MeV/u. The beam particles were tracked onto the target, and their energies were measured event-by-event. The beam-like residues were measured in a position sensitive telescope mounted at zero degrees, and neutrons were measured in the DeMoN array. The 1/2 - state of 11Be was identified by measuring coincident 320 keV γ-rays, using four NaI detectors. Full kinematic reconstruction of unbound states in 11Be was performed using coincident neutrons and 10Be ions. Detailed simulations were performed in order to interpret the data, and spectroscopic factors were calculated, using preliminary single particle removal cross sections calculated using a Glauber model. © 2005 American Institute of Physics.

Published
2005
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6. Production of superheavy elements at GANIL

Author

T. Legou, J. M. Fontbonne, G. Auger, J. C. Angélique, G. Politi, M. G. Saint-Laurent, R. Anne, E. Plagnol, J. M. Casandjian, M. Lewitowicz, N. Lecesne, A. Gillibert, R. Dayras, J.P. Wieleczko, W. Mittig, A. C. C. Villari, R. Hue, A. Drouart, D. Guerreau, F. Hanappe, N. A. Orr, J. C. Steckmeyer, Jean Péter, J. Tillier, E. Liénard, Rubens Lichtenthäler, L. Maunoury, R. de Tourreil, C. Stodel, S. Grévy, N. Amar, A. S. Lalleman, N. Alamanos, A. Wieloch, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Arnould M. Lewitowicz M. Oganessian yu. Ts. Akimune H. Ohta M. Utsunomiya H. Wada T. Yamagata T., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Wien filter, Isotope, 010308 nuclear & particles physics, Chemistry, Krypton, chemistry.chemical_element, Germanium, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Superheavy Elements, 01 natural sciences, 7. Clean energy, Nuclear physics, 13. Climate action, 0103 physical sciences, Incident beam, Atomic physics, 010306 general physics, Beam (structure)
Abstract

A long-term new experimental program has begun at GANIL, i.e. search for new super heavy nuclei and their structure. The first part consists in studying the structure of the 273110 isotope which involves the development of high intensity Se beam. In parallel, reactions involving Inverse Kinematics will be studied allowing to have a versatileness set-up. By adding germanium and electron detectors, spectroscopic studies could be made on trans-fermium elements. Preliminary results showed that the Wien Filter has a suppression of the incident beam with a 1010 factor, which is comparable with results elsewhere. We show recent results with the present set-up at GANIL in producing Fr isotopes in the Kr+Sb reaction. We present also the result of our Kr+Pb experiment, which tried to reproduce the Berkeley result of the element 118.

Published
2001
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